 By 1934, the entire length of MD 30 was proposed to be widened from its existing width of to .The only major relocation of MD 30 in the 20th century was the elimination of a grade crossing at the Western Maryland Railway (now the Maryland Midland Railway) at Glen Morris.The present bridge over the railroad was completed in 1936, but the relocated highway, which replaced what is now Old Hanover Road to the east, was not placed under construction until 1938 and did not open until 1939.